http://lemma.blogfa.com/ رياضيات دبيرستان و پيش دانشگاهي fa blogfa.com Fri, 25 Sep 2009 11:21:43 GMT http://lemma.blogfa.com/post-119.aspx <font size="3" face="tahoma,verdana,arial,helvetica,sans-serif">شروع سال تحصیلی جدید را به همه همکاران گرامی و دانش آموزان عزیز تبریک عرض می کنم.</font></p> Fri, 25 Sep 2009 11:21:43 GMT http://commenting.blogfa.com/?blogid=lemma&postid=119 lemma http://lemma.blogfa.com/post-119.aspx http://lemma.blogfa.com/post-118.aspx <font size="3" face="tahoma,verdana,arial,helvetica,sans-serif"><a href="http://www.lemma.blogfa.com/">متغیر های کیفی ترتیبی:</a> متغیر های کیفی ای که در آن ها نوعی ترتیب طبیعی وجود دارد را متغیر های کیفی ترتیبی می گوییم.</font> Mon, 24 Aug 2009 21:38:18 GMT http://commenting.blogfa.com/?blogid=lemma&postid=118 lemma http://lemma.blogfa.com/post-118.aspx http://lemma.blogfa.com/post-116.aspx <p style="text-align: right;"><font face="tahoma,verdana,arial,helvetica,sans-serif" size="3"><strong>سرشماری:</strong> اگر تمام افراد جامعه آماری را مورد مطالعه قرار دهیم می گوییم سرشماری کرده ایم.</font></p> Mon, 23 Feb 2009 12:43:44 GMT http://commenting.blogfa.com/?blogid=lemma&postid=116 lemma http://lemma.blogfa.com/post-116.aspx http://lemma.blogfa.com/post-115.aspx <font face="tahoma,verdana,arial,helvetica,sans-serif" size="3"><strong>جامعه آماری:</strong> مجموعه ای از افراد یا اشیاء است که درباره اعضای آن می خواهیم موضوع یا موضوعاتی را مطالعه کنیم.</font> Mon, 09 Feb 2009 11:38:18 GMT http://commenting.blogfa.com/?blogid=lemma&postid=115 lemma http://lemma.blogfa.com/post-115.aspx http://lemma.blogfa.com/post-114.aspx <p style="text-align: center;"><font size="3">منتظر نظرات و پیشنهاد های شما هستیم</font></p> Wed, 21 Jan 2009 10:56:03 GMT http://commenting.blogfa.com/?blogid=lemma&postid=114 lemma http://lemma.blogfa.com/post-114.aspx http://lemma.blogfa.com/post-113.aspx <link rel="File-List" href="file:///C:\DOCUME~1\Armani\LOCALS~1\Temp\msohtml1\01\clip_filelist.xml" /><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><style>/*<![CDATA[*/ <!-- /* Font Definitions */ @font-face {font-family:Tahoma; 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mso-bidi-language:#0400;} </style> <![endif]--> <p dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font face="tahoma,verdana,arial,helvetica,sans-serif" size="3"><span lang="FA" style="font-family: Tahoma; color: red;">نكته</span><span dir="ltr" style="font-family: Tahoma; color: red;"> - 36</span><span dir="ltr" style="font-family: Tahoma;"> </span><span lang="AR-SA" style="font-family: Tahoma;">اگر دو عدد وجود داشته باشند كه مجموعشان</span><span dir="ltr" style="font-family: Tahoma;"> s </span><span lang="AR-SA" style="font-family: Tahoma;">و حاصل</span><span lang="AR-SA" dir="ltr" style="font-family: Tahoma;"> </span><span lang="AR-SA" style="font-family: Tahoma;">ضربشان</span><span lang="AR-SA" dir="ltr" style="font-family: Tahoma;"> </span><span dir="ltr" style="font-family: Arial;">p</span><span dir="ltr" style="font-family: Tahoma;"> </span><span lang="AR-SA" style="font-family: Tahoma;">باشد آن دو عدد ريشه</span><span lang="AR-SA" dir="ltr" style="font-family: Tahoma;"> </span><span lang="AR-SA" style="font-family: Tahoma;">هاي معادله ي</span><span lang="FA" style="font-family: Tahoma;"><span>  </span></span><span dir="ltr" style="font-family: Tahoma;"><span> </span>  x² - sx + p = 0</span><span lang="AR-SA" style="font-family: Tahoma;">مي باشند .</span></font></p> Sat, 27 Dec 2008 16:56:18 GMT http://commenting.blogfa.com/?blogid=lemma&postid=113 lemma http://lemma.blogfa.com/post-113.aspx http://lemma.blogfa.com/post-112.aspx <P dir=rtl><FONT size=3><FONT color=#ff0000>نكته 35 –</FONT> فرض كنيد n عددي فرد و طبيعي باشد ، و a و b  اعدادي حقيقي باشند ، آنگاه معادله ي x<SUP>n</SUP>+ax+b=0 نمي تواند بيش از سه ريشه ي حقيقي داشته باشد .</FONT></P> Sat, 15 Nov 2008 10:53:49 GMT http://commenting.blogfa.com/?blogid=lemma&postid=112 lemma http://lemma.blogfa.com/post-112.aspx http://lemma.blogfa.com/post-110.aspx <font size="3">مهم نيست اگر زمين بخوريد، مهم دوباره برخاستن است . (ونيسنت لمباردي)</font> Sat, 07 Jun 2008 13:34:13 GMT http://commenting.blogfa.com/?blogid=lemma&postid=110 lemma http://lemma.blogfa.com/post-110.aspx http://lemma.blogfa.com/post-109.aspx <p class="MsoNormal" dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font size="3"><span lang="FA" style="font-family: Tahoma; color: red;">مثال</span><span dir="ltr"></span><span dir="ltr" style="font-family: Tahoma; color: red;"><span dir="ltr"></span> 9 </span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma; color: red;"><span dir="rtl"></span>-</span><span lang="FA" style="font-family: Tahoma;"> مجموعه (</span></font><font size="3"><span style="font-size: 12pt; font-family: Tahoma;"><span dir="rtl"></span><span lang="FA" dir="rtl"><span dir="rtl"></span></span>A - (B´- A<span dir="rtl"></span><span dir="rtl"><span dir="rtl"></span>^'</span></span><span dir="ltr"></span><span dir="ltr" style="font-family: Tahoma;"><span dir="ltr"></span></span><span lang="FA" style="font-family: Tahoma;"></span><span dir="ltr" style="font-family: Tahoma;"></span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma;"><span dir="rtl"></span> برابر كدام مجموعه است ؟<o:p /></span></font></p> <p class="MsoNormal" dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font size="3"><span lang="FA" style="font-family: Tahoma;">الف) </span><span dir="ltr" style="font-family: Tahoma;">A</span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma;"><span dir="rtl"></span><span> </span><span> </span><span> </span>ب) </span><span dir="ltr" style="font-family: Tahoma;">A-B</span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma;"><span dir="rtl"></span><span> </span><span> </span><span> </span>ج)</span><span dir="ltr" style="font-family: Tahoma;">A </span><span dir="ltr">∩</span><span dir="ltr" style="font-family: Tahoma;"> B</span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma;"><span dir="rtl"></span><span> </span>د) </span><span dir="ltr"></span><span dir="ltr"><span dir="ltr"></span>∅</span><span dir="ltr" style="font-family: Tahoma;"><o:p /></span></font></p> <p class="MsoNormal" dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font size="3"><span dir="ltr" style="font-family: Tahoma;"><o:p> </o:p></span></font></p> <p class="MsoNormal" dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font size="3"><span lang="FA" style="font-family: Tahoma; color: green;">جواب –</span><span lang="FA" style="font-family: Tahoma;"> گزينه ي ج درست است <o:p /></span></font></p> <p class="MsoNormal" dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font size="3"><span dir="ltr" style="font-family: Tahoma;">A-(B´-A´)=A-(B´</span><span dir="ltr">∩</span><span dir="ltr" style="font-family: Tahoma;">A)=A</span><span dir="ltr">∩</span><span dir="ltr" style="font-family: Tahoma;">(B</span><span dir="ltr" style="font-size: 14pt; line-height: 150%; font-family: Tahoma;"> </span><span dir="ltr" style="font-family: Tahoma;">U</span><span dir="ltr" style="font-size: 14pt; line-height: 150%; font-family: Tahoma;"> </span><span dir="ltr" style="font-family: Tahoma;">A´)=A</span><span dir="ltr">∩</span><span dir="ltr" style="font-family: Tahoma;">B <o:p /></span></font></p> <p class="MsoNormal" dir="rtl" style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;"><font size="3"><span lang="FA" style="font-family: Tahoma;"><o:p> </o:p></span></font></p> Sat, 07 Jun 2008 13:29:18 GMT http://commenting.blogfa.com/?blogid=lemma&postid=109 lemma http://lemma.blogfa.com/post-109.aspx http://lemma.blogfa.com/post-108.aspx <p style="text-align: right; line-height: 150%; direction: rtl; unicode-bidi: embed;" dir="rtl" class="MsoNormal"><font size="3"><span lang="FA" style="font-family: Tahoma; color: red;">نكته 34 –</span><span lang="FA" style="font-family: Tahoma;"> فرض كنيد </span><span style="font-family: Tahoma;" dir="ltr">n</span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma;"><span dir="rtl"></span> عددي مثبت و زوج باشد ، و</span><span dir="ltr"></span><span style="font-family: Tahoma;" dir="ltr"><span dir="ltr"></span> a </span><span lang="FA" style="font-family: Tahoma;">و </span><span style="font-family: Tahoma;" dir="ltr">b</span><span dir="rtl"></span><span lang="FA" style="font-family: Tahoma;"><span dir="rtl"></span><span> </span>اعدادي حقيقي باشند ، آنگاه معادله ي </span><span style="font-family: Tahoma;" dir="ltr">xⁿ+ax+b=0</span><span dir="rtl"></span></font><span lang="FA" style="font-family: Tahoma;"><font size="3"><span dir="rtl"></span></font><font size="3"> نمي تواند بيش از دو ريشه ي حقيقي داشته باشد .</font><o:p /></span></p> Sat, 07 Jun 2008 13:23:08 GMT http://commenting.blogfa.com/?blogid=lemma&postid=108 lemma http://lemma.blogfa.com/post-108.aspx